Screenings burner



pt- 13, 1932. J. CJWOODMA'N SCREENINGS BURNER Filed May 23. 1929 s Sheets-Sheet 1 INVENTOR Joseflzdl aoaman ATTO NEYS I SCREENINGS BURNER Filed May 23, 1929 3 Sheets-Sheet 2 INVENTOR fiseph C. Woodman A TTORNE Y/S' Sept. 13, 1932. c, WQ'QDMAN 1,877,214

SCREENINGS BURNER Filed May 23. 1929 s Shee tS-Sheet 3 I 4 I I l I I I I I I I I I I I I I I I I I I I INVENTOR Jase: C. Madman Mrk ATTORNEY? Patented Sept. 13, 1932 UNITED AT S JOSEPH c. WOODM-AN, or rnusnrn ivnw YORK, ASSIGNOR rolnnoamn 1nemnrwron' P ENT-orat on CORPORATION, OF NEW "YORK, N. Y., A CORPORATION OF NEW YORK 7 SCREENINGS BURNER Application lfiled May 23, 192i). s ail-tea e5 8.

' This invention relates to dehydrating incinerators and has for its principal object the disposal of wet sewage screenings-. 01 sludge in a clean and efiicient manner. p

The sludge may be Obtained froni the sewer by any suitable process. Usually it is dripping wet and in such a dense and mucky condition that it will not readily burn, and hence it must be drained or dried before it is possible to incinerate it. By't'he use of an incinerator such as disclosed in this invention, the sludge may be dumped therein just as it is extracted from the sewer, whereupon it will be dehydrated and burned. The incinerator herein 1 described is also well adapted to receivefdried'screenings or such material in any condition in which it may be obtained. Garbage and other refuse will also be readilyconshmed as well as practi: cally any other combustible material.

The above objects of this invention are ac: complished by a" novel disposition of mate, rial treating portions of the incinerator, which may include grates in combination with oil burners to dry the sludge and ignite it. At least one of the grates may be used for coal firing to augment the oil burners or to substitute for them at times when they may be out of operation. Other of the" grates may be of water tube structure combined with a water jacketed furnace wall providing a durable heat resisting structure which is adapted for use as a steam generating chant: her so that the incinerator becomes a source .Of both heat and power which may be used for any desired purpose. Forced draft and preheating means may be employed, and any perature in a gas combustion .chamber.

through which the gaseous products of combustion pass, thus reducing'smoke to; a minimum, and substantially eliminating odor.

The particular nature of the invention as well as'other objects andadvanta'ges thereof will appear more clearly from ,a detailed description of a preferred embodiment as illus trated in the accompanying. drawings in which j V Fig. 1 is a sectional longitudinal elevation thru the center of the: incinerator 1 1g. 2 is a sectional end view takenalong U the line 2'2 of Fig. 1, and

' Fig.3 is a plan vie w taken along theseetieii' 3-3 of Fig. 1. H 7

Referring to the drawings, a chutel provided with atrap-door 2 is built into the flooring or'platform 3 such. that trucks may' be driven up and dumped near'the chute,or into the chute directly." Any other suitable means of conveying material tothe chutemay be employed. The chute 11 leads into thelinciner ator 4, passingthrough an opening in the boiler or steam generating chamber 5 which forms the sides and t'op'of a combustion chamber 4a.. Directly under the chute fl is a drying grate: 6 forming a platformflocat'ed ata distancebelow such that a suitable depth ofmaterial may be deposited thereon. This grate is composed'of parallel water tubes in dividually terminating at each end inafre} ducing point 7', "therear endsoftIie-tube'S being connected thereby [to a" supporting header 8 which spans the combustion chamber Leland connectswith the water-jacketed wallsfiaof the incinerator at the pointsQin' are connected'by' the reducing joints 7 to tubes 10,whichfpass through sleeves in the front water-jacketed wall of the incinerator and connect with the header 11 by means "of the PS 12. This header extends alesgthe front of the incinerator and aroundeachend to; connect with the wat'ter-j acketed sidewalls 5a of the incineratorat' the 'oints 13 inFi The tubes are so connecte astobe readily cleaned gf j 'Below' the grate 6 is a second grate comprising the bars 14 supported at the ends by cross-members which are supported at the Sol lower part of the furnacewall, Thisgrate is adaptedltoburn coal as well as any refuse which may drop through the drying grate above. Coal is supplied through the opening in the front water-jacketed incinerator v v r closed by the doors 16. The his grate comprises an ash pit 17 hich access may be had through the doors 18. At the bottom of the pit is a drain 20 to carry-off liquids to the sewer. At each side of the drying grate 6 is provided an oil burner 25, one above and one below, (Pg-2), the purpose of which is to dry out the wet sludge that is deposited on the grate 6 and to accelerate the combustion throughout the chamber. -Water dripping from this'sludge which is not evaporated will be drained out from the bottom of the ash pit through the drain 20. The purpose of the coal fire is to augment the operation of the 011 burners, but it may be operated alone under conditions wherein the oil burners are not needed or .may be dispensed'with entirely when the hydrocarbon burners are adequate for the treatment ofthe sludge or refuse.

As the sludge dries on the upper grate 6 it is stoked through a door opening 27 that is normally closed by doors 28, and is pushed off onto an intermediate grate 26, where, if

all the moisture has'not been removed from it, the sludge becomes thoroughly dried and will begin to burn. The material is pushed off the uppergrate 6 by any suitable tool, the opera tionbeing facilitated by the parallel and longitudinal disposition of the grate members.

The intermediate grate 26 comprises the water tubes 26a the rear tubebeing somewhat raised above the plane of the grate to prevent material droppingover the rear. 'The tubes extend across the combustion chamber and are connected at one end directly to the waterjaeket of. the Wall 5a of the incinerator, and

the other ends of thetubes pass through sleeves in the Wall of the furnace atthe' opposite sideof the incinerator and are fitted with T-sections 29, an outletof each .T-section being connected withitubing 30 that with suitable fittings leads back to thewater-j acketed side wall 5a as shown in Fig. v 2. This construction allows the tubes 26 to be cleared as the T-sections are closed by removable plugs aligned with the bores of the tubes 26.

.This grate maybe observed and raked through the openings '31 inthe incinerator '35 and 14 are adapted to be shaken. "lhefarrangement is such that partly burned or unburned material may be transferred from either of these grates onto the other. The

gap between them is bridged'for this purpose by an inclined surface 36 placed above a cross wall 37 which separates the ash pit 17 from the pit 38 under the rear grate 35. This grate is accessible through the doors 39 in the side of the incinerator, and the ash pit 38 is reached through doors +10. The front and rear walls ll of the ashpits Hand 38 are shown as being Il)0i1111$ that support the front and rear wateujacketed walls of the combustion chamber of the furnace structure. The side Water-jacketed walls are likewise supported by these I-beams. The whole metallic structure of the incinerator is placed on a concrete base 42.

The gaseous products pass out of the furnace chamber 4a through the opening i3 in the rear water-jacketed wall 5a and into a gas combustion chamber lined with refractory material 51, and provided with a bafiie wall 52, the chamber being accessible through the doors 53. An auxiliary oil burner 13% is placed near the entrance of this chamber and is adapted to build up the'temperature to insure the reduction of all odors and the complete combustion of any smoke or'other floating material which might be stirred up by the draft in the combustion chamber. In this manner the amount of soot is reduced to a minimum and very little smoke is emitted from the stack, sothat the plant operates in the cleanest possible manner and with no odor that would otherwise oifend neighboring habitations. 1

An air preheatcr is placed in the chamber 50, which is comprised of lateral rectangular dncts 56 through which the flue gases pass, and vertical rectangular ducts 57 carrying a forced draft that is supplied to the preheater through a conduit 61 leading from a fan 62 drivenby a motor 63, downwardly to a conduit 58; I This conduit leads to the bottom of both grates let and 35. The amount of draft supplied to either grate may be regulated by the dampers 59 placed in the conduit at its entrance to the spaces beneath the grates. v v

The flue gas-is conducted from the preheater 55 through theo'utlet passage 64 which 'rnay be partially or completely closed by a damper 65. This damper iscontrolled by means of a cable or chain 66 passing over a pulley 67. i

It will be understoodthat various changes may be madein the arrangementof the'preferred embodiment herein described without departing from the principles of the inventionas defined in the appended claims.

. I claim: i

1. In an incinerator, the combination with a combustion chamber having a plurality of air inlets and a gas outlet, of horizontal refuse supporting means comprising a preliminary treating section and a combustion section, drying. means proximate to said prelin'iinary treating section and combustion means below i said combustion section, said sections being vertically spaced apart and the combustion section being located between the preliminary treating section and the gas outlet, the end portion of said combustion section proximate the gas outlet being slightly raised to prevent the refuse on said section from being carried out through the gas outlet and the other end portion underlying a portion of the preliminary treating section to prevent the refuse transferred from the preliminary treating section to the combustion section from falling directly onto the combustion means beneath the preliminary treating section.

2. An incinerator comprising a steam generating chamber, a plurality of water tube drying grates connecting; therewith and arranged for transfer of material from one to another, heating and igniting means associated with the grates, another grate arranged to receive material a separately fired grate, face extending between the latter grates.

3. In an incinerator, enclosing structure forming a combustion chamber having a plurality of air inlets and a gas outlet, refuse supporting means in said chamber comprising an initial grate for holding the refuse for preliminary treatment and a combustion grate said grates being substantially in parallelism and vertically spaced apart, the combustion grate extending under the initial grate and to ward the gas outlet, fuel burning means above and below said initial grate, and refuse-catchiig and fuel burning means disposed under said initial grate below the plane of said combustion grate, whereby the refuse on said grates of the supporting means is sub jected to an elevated temperature from above and below said supporting means.

4. In an incinerator, structure forming a combustion chamber provided with separate ash pits and having ai r inlets to the respective ash pits and a gas outlet, air-regulating means for the individual air inlets, refuse supportin means in said chamber comprising a substantially horizontal in tial grate for holding refuse for preliminary treatment and a substantially horizontal. combustion grate below and extending under said initial grate and toward the gas outlet, d ying means above and below said initial'grate, and other combustion grates over the individual ash pits and vertically und r said initial grate and first named combustion grate respectively.

5. In an incinerator, the combination with a combustion chamber having air inlet means and a gas outlet, of refuse supporting means comprising a preliminary treating section and a combustion section, and fuel burning and below the premeans positioned above liminary treating section of said refuse supporting means, said combustion section being supported below said preliminary treating from said drying grates,. and a transfer sursection and being arranged to extend thereproximity to the, gas outlet under and into so that the hot section on their way tothe gas outlet.

6. In an incinerator, the combination with a combustion chamber having anairvinlet means and a gas outlet, of a refuse supportmeans comprising a horizontal preliiniplaced one fromthe other to permit the trans-,

fer of refuse from the; preliminary treating section to the combustion section, the arrangement of the sections being suchthat substantially all of theliquid material draining from the. preliminary treating section will fall clear of the combustionsection, and fuel burning means above andbelow the -preliminary treating section, said combustion section being so located relative to the gas outlet that the heated gases from the fuel burning means will pass above and below it on their way to the gas outlet means.

. 7 In an incinerator, a combustion chamber having a gas outlet, a refuse supporting means in said chamber comprising a preliminary treating section and a combustion section, said sections being in different horizontal planes and displaced horizontally one from the other, fuel burning means correlated to said preliminary section, said combustion section being located in the path of the hot gases flowing from the fuel burning means to the gas outlet, structure forming a hot gas passageway communicating through said gas outlet with the combustion chamber, an air, preheater in said passageway, said preheater having an atmospheric air inlet and a heated air outlet, aconduit connected to the heated air outlet of said preheater and opening into the combustion chamber proximate to said fuel, burning means tosupply heated air thereto, and a second conduit connected to said first conduit and opening into the combustion chamber proximate to said combustion sectionfo section."

8. In an incinerator comprising a waterjacketed combustion outlet, a receiving rality of parallelly supported tubular members in communication with the water jacket, fuel burning means'adjacent said receiving grate, a second grate disposed ina different horizontal plane at one side of said receiving grate and between said fuel burning means and the gas outlet, said second grate being formed of a plurality of tubular members in communication with the water-jacket and angularly disposed relative to the tubular members of the receiving grate, and a fuel burning grate beneath said first grate and in a plane below that of said second grate.

chamber having a gas gases from thefuel burning means pass aboveand below the combustion supplying heated air to said grate formed of a plu- 

